G882 Cesium Marine Magnetometer Training Course Outline Fundamentals

G-882 Cesium Marine Magnetometer Training Course Outline • • • Fundamentals of Operational Display – ½ day Magnetic Principles – ½ day Operational display and Search Patten Planning – ½ day Search Pattern Planning – ½ day Post Processing – ½ day

Geometrics, Inc. Introduction Premier Manufacturer of Marine Magnetometers Slide 2

Marine Magnetometer – G-882 Magnetic surveying is used to provide basic geologic information for oil/gas exploration and marine mining projects. It is used to do basic research into rock types and geothermal activity including the location of kimberlite diamond pipes. It is used to locate dumping grounds of toxic materials, ancient and valuable shipwrecks of archeological significance. Magnetometry is used as a security tool to ensure that harbors and near coastal zones are clear of submarines and other military material such as mines. Single sensor Slide 3

G-880 with Flotation Device Marine magnetometers are deployed in coastal zones the world over for geological, military, environmental, archeological and marine engineering purposes. Provides the maximum detection capability for * sunken vessels * pipelines * sewage outfalls * fiberoptic telecommunication cables * power cables * various other infrastructure components Slide 4

Earth’s Magnetic Field: detection of Earth’s Magnetic Field magnetic anomalies • Earth’s dipole (N-S) magnetic field is produced by internal iron core dynamo effect. Charged particles from the sun cause a bow shock wave in the magnetosphere which leads to Diurnal Variations • Earth’s dipole magnetic field is perturbed by relatively localized contrasts in magnetization. Magnetization contrasts are caused by ferrous debris, vessels, pipelines, communication cables, magnetic minerals (predominantly magnetite). With magnetometers, one can measure the total field to detect the magnetic anomalies associated with contrasts. • • Slide 5

Data Acquisition: Single Sensor without Telemetry Typical marine magnetometer system set-up for single sensor survey GPS ON-BOARD DATA LOGGER AND PROCESSOR SHIP North SENSOR Not to scale MAGNETIC BODY Slide 6

Data Acquisition: Gradiometer without Telemetry Typical marine magnetometer system set-up for dual sensor (gradiometer) arrays GPS ON-BOARD DATA LOGGER AND PROCESSOR SHIP SLAVE SENSOR North MASTER SENSOR Not to scale MAGNETIC BODY Slide 7

Data Acquisition: Single Sensor with Telemetry Typical marine magnetometer system set-up for single sensor survey GPS ON-BOARD DATA LOGGER AND PROCESSOR SHIP North Not to scale TELEMETRY MAGNETIC BODY Slide 8 SENSOR

Data Acquisition: Gradiometer with Telemetry Typical marine magnetometer system set-up for dual sensor (gradiometer) arrays GPS ON-BOARD DATA LOGGER AND PROCESSOR SHIP SLAVE SENSOR North TELEMETRY Not to scale MAGNETIC BODY Slide 9 MASTER SENSOR

Cable Profile Slide 10

Short Cable Cesium Magnetometer Diagram DC Power Supply 28 -35 VDC RS 232 Junction Box On-Board Cable Mag. Log Data Logger COMPUTER G-882 System Block Diagram Winch RS-232 & Power Sensor 60 -450 m Electronics Driver And CM 222 Counter Slide 11

Medium Cable Cesium Magnetometer Diagram Remote Sensing DC Power Supply 28 -60 VDC RS 232 Junction Box On-Board Cable Mag. Log Data Logger COMPUTER G-882 System Block Diagram Winch RS-232 & Power Slave Sensor 60 -600 m Electronics Driver And CM 222 Counter Slide 12 Master Sensor

Deep Tow Cesium Magnetometer Diagram Constant Current DC Power Supply 13 -160 VDC RS 232 Junction Box On-Board Cable Mag. Log Data Logger COMPUTER G-882 System Block Diagram Winch RS-232 & Power Slave Sensor 60 -6000 m Telemetry Slide 13 Electronics Driver And CM 222 Counter Master Sensor

G-880 Magnetometer Sensor Pressure Vessels Slide 14

Mag. Log. NT Digital Data Acquisition System with position interpolation Slide 15

Data Acquisition Software Mag. Log. NT And Mag. Log. Lite Slide 16

Data Processing Software Mag. Map 2000 Slide 17

GPS Offset Correction Contour Maps Using 34 meter GPS Offset Correction Slide 18 No GPS offset Correction

GPS Offset Correction Profiles Magnetics in n. T 50250 49750 49000 54950 55000 55050 Distance in meters Using 34 meter GPS Offset Correction Slide 19 54950 55000 55050 No GPS offset Correction

Magnetic Model of 20 Meter Sunken Ship at 300 Meters Depth Slide 20

Data Processing – Pipeline Contour Map Seabed Cable Anomaly Detail 3 km filter (note scale of anomaly is high-resolution at 0. 22 n. T). Data Courtesy of Ark Geophysics Slide 21